diff --git a/src/cell_annotation_schema/ontology/data.py b/src/cell_annotation_schema/ontology/data.py
index 053b8b0..56177ca 100644
--- a/src/cell_annotation_schema/ontology/data.py
+++ b/src/cell_annotation_schema/ontology/data.py
@@ -64,8 +64,7 @@ def dump_to_rdf(
     prefixes["_base"] = ontology_iri
     prefixes[ontology_namespace] = ontology_iri
 
-    labelsets = [labelset['name'] for labelset in sorted(instance["labelsets"], key=lambda x: x['rank'])]
-    for labelset in labelsets:
+    for labelset in [labelset['name'] for labelset in instance["labelsets"]]:
         prefixes[labelset] = ontology_iri + f"{labelset}#"
 
     g = rdflib_dumper.as_rdf_graph(
diff --git a/src/cell_annotation_schema/ontology/export.py b/src/cell_annotation_schema/ontology/export.py
index 4a72547..850a227 100644
--- a/src/cell_annotation_schema/ontology/export.py
+++ b/src/cell_annotation_schema/ontology/export.py
@@ -48,13 +48,12 @@ def export_to_rdf(
     base_linkml_schema = read_schema(cas_schema)
 
     data = get_instance_data(data)
-    labelsets = [labelset['name'] for labelset in sorted(data["labelsets"], key=lambda x: x['rank'])]
 
     decorated_schema = decorate_linkml_ontology_schema(
         base_linkml_schema,
         ontology_namespace=ontology_namespace,
         ontology_iri=ontology_iri,
-        labelsets=labelsets,
+        labelsets=[labelset['name'] for labelset in data["labelsets"]],
     )
     expanded_schema = expand_schema(
         config=None, yaml_obj=decorated_schema, value_set_names=["CellTypeEnum"]